Which of the following lines is parallel to x = 8?

Interestingly enough, the line x=8 is parallel to the y axis. The line x=8 means that x=8 no matter what y equals.

So any line that is parallel to the y axis could be the answer.

x=4

x=12

x=-17

x=-2.5 are all examples of lines that are parallel to x=8. Perhaps that will answer your question.